Finding the Fourth Proportional to 21,379.12, 32,080.72 and 11,518.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,379.12 : 32,080.72 = 11,518.16 : x
2. Step 2: Convert to fraction form
   21,379.12/32,080.72 = 11,518.16/x
3. Step 3: Cross multiply
   21,379.12x = 32,080.72 × 11,518.16
4. Step 4: Simplify right side
   21,379.12x = 369,510,865.88
5. Step 5: Solve for x
   x = 369,510,865.88/21,379.12
6. Step 6: Final answer
   x = 17,283.73